let 100 kg=100%+25%=125%
but actual weght is only 100*0.7=70
70kg=125</p><pstyle="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px"data−pxy="true">100kg=?</p><pstyle="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px"data−pxy="true">crossmultiply</p><pstyle="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px"data−pxy="true">\frac{100\times125}{70}</p><pstyle="color:rgb(0,0,0);margin−top:2px;margin−bottom:2px"data−pxy="true">=178.57%
profit percentage is 78.57 %